Ah, thanks, it is my fault, for mis-understanding the hint from GHC.
And what is the difference between fromIntegral and fromInteger ?
------------------
L.Guo
2008-01-01
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From: Mark T.B. Carroll
At: 2008-01-01 01:42:37
Subject: Re: [Haskell-cafe] How to convert number types.
Perhaps fromIntegral does what you want?
Mark